<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>TS测试</title>
</head>
<body>
  <div id="app">
    <h1>倒计时：</h1>
    <h1 class="countdown-box"></h1>
  </div>
  <script type="module" src="src/vue.js"></script>
  <script type="module">
    // const vue = new Vue({
    //   el: '#app',
    //   data: {
    //     countdownStr: ''
    //   }
    // })
    // vue.data.countdownStr = '123'
  </script>
</body>
</html>